R5F21217JFP#U0 Renesas Electronics America, R5F21217JFP#U0 Datasheet - Page 133

• Manufacturer Part Number: R5F21217JFP#U0
• Description: IC R8C/20 MCU FLASH 48LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F21217JFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• For Use With: R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00 Aug 27, 2008
REJ09B0250-0200
Figure 13.3
Watchdog Timer Reset Register
Watchdog Timer Start Register
Count Source Protection Mode Register
b7
NOTES:
b7
b7 b6 b5 b4
NOTES:
1.
2.
1.
2.
0 0 0 0
Do not generate an interrupt betw een 00h and the FFh w ritings.
When the CSPRO bit in the CSPR register is set to 1 (count source protection mode enabled),
0FFFh is set to the w atchdog timer.
When w riting 0 to the CSPROINI bit in the OFS register, the value after reset is set to 10000000b.
Write 0 before w riting 1 to set the CSPRO bit to 1.
0 cannot be set by a program.
b3 b2 b1 b0
0
Registers WDTR, WDTS, and CSPR
0
b0
b0
0
When w riting 00h before w riting FFh, the w atchdog timer is reset.
The default value of the w atchdog timer is set to 7FFFh w hen count source protection
mode is disabled and 0FFFh w hen count source protection mode is enabled.
The w atchdog timer starts counting after a w rite instruction to this register.
Bit Symbol
(b6-b0)
CSPRO
Symbol
Symbol
Symbol
WDTR
WDTS
CSPR
Page 115 of 458
—
Reserved bits
Count source protection mode
select bit
Address
Address
(2)
000Dh
000Eh
Address
Bit Name
001Ch
Function
Function
Set to 0
0 : Count source protection mode disabled
1 : Count source protection mode enabled
Indeterminate
Indeterminate
After Reset
After Reset
After Reset
Function
(1)
00h
(1)
(2)
13. Watchdog Timer
WO
WO
RW
RW
RW
RW
RW